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ACST10 Datasheet(PDF) 7 Page - STMicroelectronics |
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ACST10 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 13 page ACST10 Application information Doc ID 15237 Rev 3 7/13 Figure 16. Universal drum motor control – typical diagram 2.2 AC line transient voltage ruggedness In comparison with standard Triacs, which are not robust against surge voltage, the ACST10 is self-protected against over-voltage, specified by the new parameter VCL. The ACST10 switch can safely withstand AC line transient voltages either by clamping the low energy spikes, such as inductive spikes at switch off, or by switching to the on state (for less than 10 ms) to dissipate higher energy shocks through the load. This safety feature works even with high turn-on current ramp up. The test circuit of Figure 17 represents the ACST10 application, and is used to stress the ACST switch according to the IEC 61000-4-5 standard conditions. With the additional effect of the load which is limiting the current, the ACST switch withstands the voltage spikes up to 2 kV on top of the peak line voltage. The protection is based on an overvoltage crowbar technology. The ACST10 folds back safely to the on state as shown in Figure 18. The ACST10 recovers its blocking voltage capability after the surge and the next zero current crossing. Such a non repetitive test can be done at least 10 times on each AC line voltage polarity. Universal motor Motor direction setting Speed motor regulation Rg AC Mains Stator MCU Vcc 12V ACST Rotor MCU |
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